Matplotlib docs on symlog

Issues that could have been fixed by using a symlog scale:

• [charts] Bar charts with log scale axis do not render #17170
• [charts] Area Chart does not allow logarithmic scale #13759
• [charts] log scale with negative and positive domain gives NaN entries #12361
• [charts][LineChart] inconsistent behavior between yAxis scaleType "log" and "linear" for null values in the series #15322